APA aipamena

Boyes,William, & Melvin,Michael. (2003). Principles of Economics. Cengage Learning.

Chicago Style aipamena

Boyes,William, and Melvin,Michael. Principles of Economics. Australia: Cengage Learning, 2003.

MLA aipamena

Boyes,William, and Melvin,Michael. Principles of Economics. Cengage Learning, 2003.